Centrifugal pump



R. N. EHRHART CENTRIFUGAL PUMP 2 SheetsSheet 1 Filed May 5, 192'? Aug. 7, 1928.

R. N. EHRHART GENTRIFUGAL PUMP Filed May 5, 1927 2 Sheets-Sheet 2 mwmmw Patented Aug. '7, 1928.

U hi i "ITS RAYMOND N. EI-IRI-IART, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO ELLIOTT COMPANY, OF PITTSBURGH, PENNSYLVANIA, A CORPORATION PENNSYLVANIA.

' CEN'IRIFUGAL PUMP.

Application filed May 3,

pumps of templated which are the. general character herein conare called upon to handle fluids hlghly impregnated with acid or other corrosive or. erosive materials or substances. fect-ively, in the art In order to meet this condition efit has heretofore been proposed to construct the entire pump of a material capable of resisting corrosion or erosion.

This procedure, however, is extremely expensive because of the greater cost of the materials thus required as compared to the cost of cast iron which is fr used.

equently In jet condensers which may, for example,

be of the my Paten 1925, this required pump structures.

reason of general construction illustrated in t No. 1,533,840, granted April 14:, matter has heretofore frequently the use of extremely expensive This is true partly by the fact that in such condensers the water is heated before it gets to the pump, whereby the action referred to is more virulent than is the case with ordinary pumps.

Inasmuch as large jet condensers require quite large pump installations, it is highly de structions constructe sirab-le, if possible, to avoid conrequiring the entire pump to be d of acld resisting materials.

In accordance with the present invention there is provided an improved pump structure in which only that portion of the pump subjected to high water velocities where the erosion and corrosion present a really serious problem, are of special design and construction action, bu

not only to effectively resist such t to facilitate removal or replacement thereof as may be necessary.

In the accompanying drawings, there is shown, for purposes of illustration only, a

preferred embodiment of the present inven- Fig. 1 i

s a vertical sectional View through V 1927. Serial No. 188,469.

one form of jet condenser and centrifugal pump serving the same in accordance with the present invention; and,

Fig. 2 is a view on an enlarged scale, partly in section and partly in elevation, ilon lustrating' more particularly the pump structure.

The et condenser and pump arrangement, illustrated herein, while capable of assuming a wide variety of different shapes and M arrangements, may be of the general nature shown in my patent previously referred to. In such cases, the housing 2 of the pump supports the jet condenser structure 3, thereby making it extremely difiicult to effect removal of the pump as awhole from its foundation as is now required to replace the different parts thereof.

In accordance withthe present invention, one wall of the housing 2 is provided with an offset member or members 4 providing in effect a series of sockets 5. These sockets are constructed in such manner that they effectively cooperate with the section A of the pump constituting part of the volute and discharge therefor. The section A. may be secured in position within the housing in any desired manner as for example, by bolts 6 passing through the. offset members 4.

he portion 7 of the housing illustrated more particularly in Fig. 2 of the drawings,, is machined to provide a true face prcferably lying in a plane intersecting the longitudinal axis of the centrifugal pump, and the section A is of such construction that its so outer face which is also preferably machined, coincides with the face 7.

The remainder of the volute and discharge for the pump, comprises a section B in the form of a cover having a machined face 8 9 cooperating with the machined face 7 on the pump housing and the machined face coinciding therewith on the pump section A.

The cover section B is entirely exteriorly located with respect to the housing 2 while II)0 the section A is interiorly located relatively thereto.

The sections A and B may be of any desired metal having such characteristics as to more effectively resist the corrosion or erosion referred to. When constructed as disclosed herein, access to the pump structure is permitted by the removal of the cover section B which may, if desired, be replaced at will, and removal of the entire pump from 11 its bearings and consequently removal of the section A is permitted by reason of splitting the sections along a line coinciding with the major axis of the housing and intersecting the axis of the pump shaft and the bearings therefor as illustrated in Fig. 2.

Certain advantages of the present inven tion arise not only from the utilization of relatively more durable material from the standpoint of corrosiveor erosive action, but from the provision of sections of such material, which sections are of such nature as to facilitate removal thereof.

Further advantages ofthe invention arise from the provision of sections of the nature referred to, split along the major axis of the housing and constructed in such manner that the outer face of the section. supported within the pump housing coincides with the machined face thereon.

Still further advantages of the invention arise from the provision of a pump section constituting part of the volute and discharge therefor supported within depressions or sockets formed on the pump housing.

I claim: V

1.- A centrifugal pump, comprisinga housing receiving the water supply for said pump, and a volute anddischarge member for said pump comprising separable sections removably securedto said housing, one of said sections being located within the housing and the other of said sections being ex teriorly secured to said housing.

2. A centrifugal pump comprising a housing receivingihe' water supply for said pump, and a volute and discharge member for said'puinp split along the major axis of said housing and in a plane substantially parallel to and including the axis of the volute to form sections independently removable therefrom.

r 3. A centrifugal pump comprising a housmg recelving the water supply for said tioned within the housing and. the other of said sections being exteriorly secured thereto.

i. A centrifugal pump comprising a housing having a machined face, sa1d housing being adapted to receive the water supply for sa1d pump, and a volute and'discharge mem her for said pump comprising sections secured to said housing, said sections being split in such manner that the cooperating faces thereof coincide with the "machined face on said housing. 7

5. A centr fugal pump comprising a housing adapted to receive the water supply for said pump, and a volute and discharge member comprising sections secured to said housing, said sections being split in such man nor that thecooperating fa'ces thereof coincide with the machined face on said housing, one of said sections being 'detachably supported within the housing and theother of said sections being exteriorly secured thereto.

6. A centrifugal pump comprising a housing having a machined face, said housing being adapted to receive the water supply for said pump, and a volute and discharge member comprising sections secured to'said housing, said sections being split insuch manner that the cooperating faces thereof coincide 6O ing havinga machined face, said housing be t with the machined face on said housing, one 7 of said sections being detachably supported within the housing and the other of said sections being exteriorly secured'thereto,'

socketed said first mentioned section being within sa1d housing to terminate substan tially flush therewith.

In testimony whereof I have hereunto set I my hand, i 

